Murrayafoline A attenuates the Wnt/beta-catenin pathway by promoting the degradation of intracellular beta-catenin proteins

作者：Choi Hyuk; Gwak Jungsug; Cho Munju; Ryu Min Jung; Lee Jee Hyun; Kim Sang Kyum; Kim Young Ho; Lee Gye Won; Yun Mi Young; Nguyen Manh Cuong; Shin Jae Gook; Song Gyu Yong^*; Oh Sangtaek

来源：Biochemical and Biophysical Research Communications, 2010, 391(1): 915-920.

DOI：10.1016/j.bbrc.2009.11.164

• Marrayafoline A
• Colon cancer
• beta-catenin
• Protein phosphorylation/degradation

Molecular lesions in Wnt/beta-catenin signaling and subsequent up-regulation of beta-catenin response transcription (CRT) occur frequently during the development of colon cancer To identify small molecules that suppress CRT. we screened natural compounds in a cell-based assay for detection of TOPFalsh reporter activity Murrayafoline A. a carbazole alkaloid isolated from Glycosmis stenocarpa, antagonized CRT that was stimulated by Wnt3a-conditioned medium (Wnt3a-CM) or LiCl, an inhibitor of glycogen synthase kinase-3 beta (GSK-3 beta). and promoted the degradation of intracellular beta-catenin without altering its N-terminal phosphorylation at the Ser33/37 residues, marking it for proteasomal degradation, or the expression of Siah-1. an E3 ubiquitin ligase Murrayafoline A repressed the expression of cyclin D1 and c-myc, which is known beta-catenin/T cell factor (TCF)-dependent genes and thus inhibited the proliferation of various colon cancer cells.

• 出版日期2010-1-1